Abstract
BS>It is shown that a convolution technique, developed by Kellerer can be used to generate energy deposition spectra, by either forward or reverse shifts, for many pathlengths from a limited set of experimental data for low energy fast protons ( approximates 45 MeV) corresponding to pathlengths of radiobiological interest. For medium energy fast protons ( approximates 600 MeV) the method fails if shifts based upon the expected average energy losses are used as the base for these calculations. However, if shifts based on an experimental determination of the average energy loss in the volume of interest are used then good agreement with experiment is obtained. This reflects the effect of energy transport into and out of the counter volume by high energy secondary particles, resulting in a significant loss of energy from the volumes in which the measurements have been made and the high probability for a significant number of incident particles not undergoing collisions over the test pathlength. This results in experimental values of average energy which are different than those calculated using stopping power theory. (auth)
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call